Simulasi Regulator Tekanan Untuk Kendaraan Berbahan Bakar Gas Dengan Program Fire

A series of researches about characteristic of stability and performance of conversion kits shows that imported conversion kits manufactured by several vendors that are used by public in Indonesia still need some improvement in their design. The conversion kits consist of CNG main tank, mixer and pressure regulator. In this research simulated pressure regulator which have three steps restriction which the change of valves position is influenced by pressure inlet and pressure in the chambers. The simulation of fluid flow in pressure regulator can be modelled with the aide of FIRE v70b_Pl3. In this modelling were done variation of inlet and outlet position. The varying made which aim to observe correlation of the change of pressure and outlet mass flow with position changing. Besides, were done varying outlet diameter of pressure regulator and the change of inlet pressure. The results show that the change of inlet and outlet position were done not shows significant changing both pressure in the chambers and outlet mass flow from pressure regulator

A Study on Adsorption Refrigerator Driven by Solar Collector Using Indonesian Activated Carbon

In the present work, the performance of an adsorption refrigerator driven by a solar collector was investigated. The adsorbent used in this study was 6.5 kg ordinary granular activated carbon of coconut shell produced in the Sumatera Utara province of Indonesia, 3 liters of methanol as adsorbate and 4.5 litres of water as the medium that was cooled. The experiments were carried out under varying weather conditions during seven cycles with total solar radiation about 2.681-3.918 kWh/m2/cycle. In this study, the values of the coefficient of performance (COP) obtained were about 0.0827-0.1271. The values of specific cooling power (SCP) obtained were in the range of 0.01839-0.01883 kW/kg. The experimental results show that the adsorption refrigerator system can deliver an evaporator temperature of about 2.81-13.61°C